Mine-door closer.



T. RAMSAY, MINE DOOR CLOSER. APPELIQATIOH FILED JULY 17,1913.

1,], 00,690, I Patented June 16, 1914.

Wmeowo I taut. The result will be pieeisely the same,

except that it would be possible for him then to leave both doorsslightly open but for the fact that the current of air flowing; alongthe direction indicated at lwould slam first one closed and then theother. I prefer,

however, to employ the weight; and if the current of air be in theopposite direction I would make the weight of ample size so as ,to holdboth doors closedegeinst the force 7 hinged thereinand adapted to closewith the wind; combined with a pair of guides between the doors, apulley within the pessageway beyond the leeward door, the bulkhead orthe letter having on opening, a cord attached at its ends to the leewardsides of both doors and having a. short stretch leading around saidpulley and a long stretch leading through said opening and over saidguides and a weight on the cord between the guides, for the purpose setforth.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

THOMAS RAMSAY.

Witnesses:

CHRISTOPHER G. HALVERSON, Gnome Vierront

